Alfred Marshall was one of the most influential economists of his time. His book, Principles of Economics, was the dominant economic textbook in England for many years. source
Civilized countries generally adopt gold or silver or both as money.
The price of every thing rises and falls from time to time and place to place...
Capital is that part of wealth which is devoted to obtaining further wealth.
There's only so far you can take a relationship before you got to get into things that are too serious or over the top.